@gmerendino in the get function you need to pass the Id of the mapreduce - if it is a JSMapReduce you can retrieve it with a fetch - if you create a type that mixes map reduce do a fetch on this type to retrieve the ID

@trothwein There were no errors for that specific job. It was actually sitting in the queue behind another job. The job I tried to cancel had 180k pending messages on the queue. Could that be the reason it took that long (But it was the same in 7.8)? It actually completed after 50 mins.